A Problem Solving Method to Boundary of Interval Based Watermark in Anonymous Network Flows

Ability of intruder tracing, is deterrence to insecurity. One of the methods of intruder tracing is network flow watermark. In this technique, the pattern of network flow is changed, to watermark the special flow of traffic and we can be tracing it in the output boundaries of the network. In this research interval based watermark (IBW) method that ever on TOR anonymous network has not been evaluated, is implement to be practical in the real environment was evaluated on TOR. The analysis results show that this method has the weakness of the border. The proposed method to improve IBW method, with creating a blank space as guard at boundary intervals was used to solve problem in boundary. After implement and evaluate the proposed method, Measurement accuracy based on decoding rates, false positive and false negative. Show proposed method has better performance compared to old method. Also for evaluate stealthness with assume intruder scenario, was used statistic K-S test, entropy test and conditional entropy test to detect watermark. The results show that proposed method in the K-S test and entropy test has acceptable stealthness level.